ICND1 – IPv6 Questions

+ Static IPv6: The IPv6 address, subnet prefix length and default gateway are configured manually in the system configuration file. + Dynamic Host Configuration Protocol for IPv6 (DHCPv6): this mode requires a DHCPv6 server in your LAN. This is the most used mode for IPv6 assignment. There are two methods of DHCPv6: – stateless mode: Only extended information, such as primary and optional secondary DNS server, is obtained from a DHCPv6 server. IPv6 address is not assigned, so the IPv6 address from the Ethernet configuration is set for a Static address of Ethernet interface. – stateful mode: DHCPv6 server maintains a database of leased IPv6 addresses, and assigns to the client an unused IPv6 address. The DHCPv6 server specifies also a primary and optional secondary DNS server. The DNS server is used to resolve the IP address for a known host name. + IPv6 Stateless Address Autoconfiguration (SLAAC): provides the ability to address a host based on a network prefix that is advertised from a local network router via Router Advertisements (RA). Notice that with this mode, the device which requires an IPV6 always receive a dynamic IPv6 address.

The question asks about “stateless assignment of IPv6 addresses” which means stateless mode of DHCPv6.

Question 2

Explanation

According to the official IANA website “Users are assigned IP addresses by Internet service providers (ISPs). ISPs obtain allocations of IP addresses from a local Internet registry (LIR) or National Internet Registry (NIR), or from their appropriate Regional Internet Registry (RIR): https://www.iana.org/numbers

Question 3

Explanation

To run IPv6 on an interface we have to configure an IPv6 on that interface somehow -> A is correct.

IPv6 must be enabled first but with the “ipv6 unicast-routing”, not “ipv6 enable” command -> D is not correct.

Question 4

Question 5

Question 6

Explanation

Leading zeros in IPv6 are optional do that 05C7 equals 5C7 and 0000 equals 0 -> D is not correct.